Cyclic oxacarbene complexes of the cycloheptatrienylmolybdenum auxiliary MoL2(η-C7H7), L = CO or P-donor ligand: isolation and subsequent cyclisation of a hydroxyvinylidene intermediate

Abstract

The cyclic oxacarbene complexes [Mo{[graphic omitted]}L₂(η-C₇H₇)]PF₆[n= 1 or 2; L = CO, L₂= Ph₂PCH₂PPh₂ or Ph₂PCH₂CH₂PPh₂(dppe)] have been synthesised and the 1-oxacyclopent-2-ylidene ligand in the derivative n= 1, L₂= dppe shown to adopt a horizontal orientation; the crystallographically characterised, hydroxyvinylidene complex [Mo{CC(H)CH₂CH₂CH₂OH}(dppe)(η-C₇H₇)]PF₆ is an isolable intermediate in the formation of [Mo{[graphic omitted]}(dppe)(η-C₇H₇)]PF₆.